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If we're reifying non-value types (e.g. MethodTypes), we can't use them
as type arguments for TypeTag/WeakTypeTag factory methods, otherwise
the macro expansion won't typecheck:
http://groups.google.com/group/scala-internals/browse_thread/thread/2d7bb85bfcdb2e2
This situation is impossible if one uses only reify and type tags, but
c.reifyTree and c.reifyType exposes in the macro API let anyone feed
anything into the reifier.
Therefore I now check the tpe that is about to be used in TypeApply
wrapping TypeTag/WeakTypeTag factory methods and replace it with AnyTpe
if it doesn't fit.
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